package mining

import (
	"os"
	"path/filepath"
)

// AtomicWriteFile("/home/alice/.config/lethean-desktop/miners/installed-miners.json", data, 0600)
func AtomicWriteFile(filePath string, data []byte, perm os.FileMode) error {
	directoryPath := filepath.Dir(filePath)

	temporaryFile, err := os.CreateTemp(directoryPath, ".tmp-*")
	if err != nil {
		return ErrInternal("create temp file").WithCause(err)
	}
	temporaryFilePath := temporaryFile.Name()

	success := false
	defer func() {
		if !success {
			os.Remove(temporaryFilePath)
		}
	}()

	if _, err := temporaryFile.Write(data); err != nil {
		temporaryFile.Close()
		return ErrInternal("write temp file").WithCause(err)
	}

	if err := temporaryFile.Sync(); err != nil {
		temporaryFile.Close()
		return ErrInternal("sync temp file").WithCause(err)
	}

	if err := temporaryFile.Close(); err != nil {
		return ErrInternal("close temp file").WithCause(err)
	}

	if err := os.Chmod(temporaryFilePath, perm); err != nil {
		return ErrInternal("set file permissions").WithCause(err)
	}

	if err := os.Rename(temporaryFilePath, filePath); err != nil {
		return ErrInternal("rename temp file").WithCause(err)
	}

	success = true
	return nil
}